YOKOGAWA 320110, User Manual

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IM 3201–E
3.7 Checking Battery Amount and Battery Replacement
<Checking the Remaining Amount of Battery>
The condition where the pointer does not come to zero even
when the zero ohm adjust knob is turned clockwise to the
extreme position is to indicate that the built-in battery is worn out.
Replace the battery (R20P, 1.5 V, one piece).
<Battery Replacement>
CAUTION
· Before starting the replacement of the battery, disconnect
the instrument from the circuit to be measured to prevent an
electrical shock hazard.
· Check polarity before installing the battery properly.
To replace the battery, remove the screw of the center of the
bottom case. For battery installation, follow the indication of
polarity noted on the battery holder case.
5. Current for each measuring range is as follows, at zero position
of resistance scale.
× 1 Ω range approximately 150 mA
× 100 Ω range approximately 1.5 mA
× 10 kΩ range approximately 15 μA
6. For checking quality of capacitors, use the × 10 kΩ range.
A good capacitor is charged by the battery voltage of the tester,
to cause a deflection of the pointer. The pointer is then returned
gradually to the “∞” position. This phenomenon appears more
markedly as greater the capacity of a capacitor becomes.
Degraded capacitors will not deflect the pointer. And shorted
capacitors will not return the pointer in the “∞” direction. These
are defective capacitors.
7. In case of resistance measurement, polarity of the self-contained
battery is positive at the COM- terminal, and negative at the
V.A. Ω
terminal.
Take this relation into consideration when diodes or transistors
are to be tested.